Automatic core centralizer



H. S. LEE

ATUMATIC CORE GENTRALIZER Filed Jan. 3, 1925 2 Sheets-Sheet l neg. 2@ 1925 H. S. LEE

AUToMATG com; GENTRALIZER 8, 1925 2 Sheets-Sheet 2 Filed Jan.

Patented Dec.. 29, 1925.

' UNITED STATESl HARRY S. LEE, OF PLYMOUTH, MICHIGAN.

AUTOMATIC COR CENTRALIZEB.

App1cation filed January 8, 1925. Serial No. 1,167.

To all whom t concern.'

Be it known that I, HARRY S. LEE, a citizen of the United States, residing at Plymouth, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Automatic Core Centralizers', of which ,the following is a speeiication.- l I This invention relates to permanent moulds and has for its object 4a permanent mould vprovided with mea-ns for 'automatically compensating for-the expansion of the mould away from the core when the mould heats up. This results in accurately centrahzing the core v1n 'the mould and prevents the core from shifting around so as to make an imperfect casting.

an inch.

Permanent moulds made out of metals are bound to expand slightly as they heat up during the pouring operation. IVhere the core is supported in thev permanent mould by means of contact with the walls of the mould it will be apparent that the mould vWalls will draw slightly away from the core, resultingin a condition which permits the,

core to shift slightly-a few thousandths of If such shifting takesl place, whiehis quite likely, an accurate casting will not result.

' In my 'co-pending application, Serial No. 1168 I have shown and described a mechanical adjustment by which this change of relations between the two members can he accommodated." In such application the generic invention is there claimed. The present application is directed to a different species of the generic invention. This species not only affords a dilferent way to aecomplish the same' general object, but it has the added feature thatthe same auto- .matically takes eare'of compensating for the expansion.' Furthermore, it` has the added feature that the strength of each individual automatic device may bealtered to suit the observed conditions. This will be more fully explained hereinafter.

Referring to the drawings:

Fig. l is a plan View (fragmentary in character) of a moulded equipment with my automatic compensating device.

'Fig'. 2 is a section laken on theline 2 2 ot' Fig. l.

Fig. 3 is a vertical, section of the top of the mould and the core.

.Fig. Lr 1s a plan view (fragmentary 1n character) of a modified form of the invention. v

Fig.' 5" is a section taken on the line of Fig. 4.

The mould sections are designated a and l), and are usually made` of metal with suitable coatin on the interior of some reractory materlal of some special 'composition, The mould sections are grooved as at c and d to provide annular grooves and the intervening rib c.- The core f has similar ribs and a core may be fitted into the other section which will temporarily support it until `the withdrawn mould section is re placed. This will suspend the core within the mould and in proper centralized position.

Due to the heating up of the mould due 1n ihepouring operationsthe mould parts will expand several thousandths of an inch.

This-will leave a slight clearance around the head of the core which will permit it to shift slightly. I prevent this by an automatic compensating device, comprising a plurality ot' sliding blocks L which are yieldingly urged against the core by means of the coil springsz' shown in Fig. 3, or by the flat springs j 'shown in Fig. 5. These fiat springs shown in Fig. 5 may also be suhject lo a thermal action, that is to say, as the springs heat up they tocrwill expand and will have a stronger spring action on the lsliding blocks. However, this thermalA vfeature. is not made the subject of the claims/in the'present application, but is nuulethelsuhjeet of a co-pending applicationerial No. lllhpwherein tl1e thermostatic principle of compensation is Shown worked out in the most approved fashion.

The compression of the springs i may vary slightly or may become impaired by wear. It is possible to nicely get the best possible adjustment of these springs by releasing' the jamb nuts Il: and applying a screw dri/ver to the end ot the screw stud m; for instance, if an inspection shows that there is a tendency for the core to shift slightly to one side, notwithstanding these compensating devices, this may be very easily remedied by increasing `the spring strength on that side or weakening it on the other side, orv both.

This type of the invention has the advantage thatfits-"action is automatic and no change is required ot the compensating dea fill vice. at any time. It the moulds cool slightly during tlie interruption of the pourings it does not atl'ect the operationof the-device. However, it is not possible toy get an absolutely fixed adjusti'nent, as is tlie case with the compensating devices described in my cti-pending application, Serial Noll-68.

What l claim is: j

l. n a permanent mould, the combina,- tion of a plurality 'ot expaiisiblo mould sections, a core supported in tlic mould sections by contact with the same, and anaiitomatic means for centralizing the coreI notwithstanding cliange olE conditions diie to the expansion of thel mould sections.

2. In a permanent mould, the combination ot a plurality of expansible mould sections,

a non-expansdfle core supported in the' 4mould by contact with tlie mould sections,

and an automatic means l'or taking up am7 clearance between the core and the mould i tions, a non-expansible core supported iii the mould by Contact witli the mould sections and adjustable strength automatic means in tlie form of sliding` spacers for taking up any clearance tliat may exist between the core and tlie mould duc to tbc expansion of the latter.

4. In a' permanent mould, tlie combination of a plurality of expansible mould scctions, a core supported tlierein by Contact tlie core to take up the clearance due to the' expansion of the mould sections.

6. In a permanent mould, the combination of a plurality of mould Sections of expansible material, a core supported therein by contact Wit-li 'flic Walls ot' said sections, and a-plui'ali-ty of sliding blocks for engaging tlie cores` springs for projecting tlie blocks and adjustable abutmcnts for the springs.

In testimony Wlieiieot'- I have atliXed my signature.

HARRY S. LEE. 

